166293577217 has 4 divisors (see below), whose sum is σ = 166772809776. Its totient is φ = 165814344660.

The previous prime is 166293577183. The next prime is 166293577223. The reversal of 166293577217 is 712775392661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166293577217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166293577277) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239615759 + ... + 239616452.

It is an arithmetic number, because the mean of its divisors is an integer number (41693202444).

Almost surely, 2^166293577217 is an apocalyptic number.

It is an amenable number.

166293577217 is a deficient number, since it is larger than the sum of its proper divisors (479232559).

166293577217 is an equidigital number, since it uses as much as digits as its factorization.

166293577217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479232558.

The product of its digits is 6667920, while the sum is 56.

The spelling of 166293577217 in words is "one hundred sixty-six billion, two hundred ninety-three million, five hundred seventy-seven thousand, two hundred seventeen".